[0001] This application claims priority to Chinese Patent Application No.
201710456234.0, filed with the Chinese Patent Office on June 16, 2017 and entitled "COMMUNICATION
METHOD AND DEVICE", which is incorporated herein by reference in its entirety.
TECHNICAL FIELD
[0002] Embodiments of the present invention relate to the field of communications technologies,
and in particular, to a communication method and a device.
BACKGROUND
[0003] During standardization of the 5th mobile communications (the 5th Generation, 5G)
new radio (New Radio, NR), a case in which a bandwidth capability of a terminal device
is less than a system bandwidth is supported. At the radio access network (Radio Access
Network, RAN) 1 #88 meeting, use of a two-step resource allocation manner to support
data transmission of a terminal device whose bandwidth capability is less than a system
bandwidth has been discussed and approved. To be specific, a bandwidth part is first
indicated to the terminal device, and then resource allocation and data transmission
are performed on the bandwidth part. At the RANI #88b meeting, it has been further
specified that for a carrier, a network may semi-statically configure one or more
bandwidth parts for a terminal device, where a bandwidth of each bandwidth part is
not greater than a maximum bandwidth capability of the terminal device. The maximum
bandwidth capability of the terminal device is a terminal device capability, and refers
to a maximum transmission bandwidth that can be supported by the terminal device.
The terminal device reports the maximum bandwidth capability of the terminal device
by using a preamble or a message 3 during initial access or by using higher layer
signaling.
[0004] When a plurality of bandwidth parts are configured for a terminal device, how to
reduce power consumption of the terminal device is an urgent problem that needs to
be resolved.
SUMMARY
[0005] Embodiments of the present invention provide a communication method and a device,
to reduce power consumption of a terminal device and reduce system overheads.
[0006] According to a first aspect, a communication method is provided. The method may be
performed by a terminal device. The method includes: determining, by a terminal device,
that a plurality of BPs are activated, where the plurality of BPs are in a same carrier,
the plurality of BPs include a first BP and a second BP, a first common search space
CSS is configured in the first BP, and common DCI is configured in the first CSS;
and detecting, by the terminal device, the common DCI only in a second CSS when the
second CSS is configured in the second BP, where the common DCI is configured in the
second CSS.
[0007] According to a second aspect, a communication method is provided. The method may
be performed by a network device. The network device is, for example, a base station.
The method includes: configuring and activating, by a network device, a plurality
of BPs for a terminal device, where the plurality of BPs are in a same carrier, the
plurality of BPs include a first BP and a second BP, a first CSS is configured in
the first BP, and common DCI is configured in the first CSS; and sending, by the network
device, first indication information to the terminal device when the network device
configures a second CSS for the second BP, where the first indication information
is used to instruct the terminal device to detect the common DCI only in the second
CSS, and the common DCI is configured in the second CSS.
[0008] In the embodiments of the present invention, when the plurality of BPs configured
for the terminal device are activated, if the second CSS is configured in the second
BP, and the common DCI is configured in the second CSS, the terminal device can directly
detect the common DCI in the second CSS, with no need to detect the common DCI in
a CSS configured on another BP. This can avoid an increase in the quantity of blind
detections of the terminal device and an increase in power consumption of the terminal
device.
[0009] In a possible design, when a CSS is not configured on other BPs than the first BP
in the plurality of BPs, the terminal device detects the common DCI in the first CSS,
and receives a measurement reference signal in the second BP. Correspondingly, when
a CSS is not configured on other BPs than the first BP in the plurality of BPs, the
network device sends second indication information to the terminal device, where the
second indication information is used to instruct the terminal device to receive a
measurement reference signal in the second BP.
[0010] The terminal device may receive the measurement reference signal in the second BP,
with no need to receive a measurement reference signal in the first BP, thereby minimizing
a quantity of blind detections of the terminal device and reducing power consumption
of the terminal device.
[0011] In a possible design, when the second CSS is configured in the second BP, the terminal
device receives first indication information sent by a network device, where the first
indication information is used to instruct the terminal device to detect the common
DCI in the second CSS.
[0012] The network device may instruct, by using the first indication information, the terminal
device to detect the common DCI in the second CSS. This manner is relatively simple,
and the terminal device can know, in a timely manner, a place to detect the common
DCI.
[0013] In a possible design, when the second CSS is configured in the second BP, the terminal
device receives a measurement reference signal in the second BP. Correspondingly,
when the second CSS is configured in the second BP, the network device sends third
indication information to the terminal device, where the third indication information
is used to instruct the terminal device to receive a measurement reference signal
in the second BP.
if the second CSS is configured in the second BP, the terminal device may receive
the measurement reference signal in the second BP, with no need to receive a measurement
reference signal in the first BP, thereby avoiding an increase in a quantity of times
that the terminal device blindly detects a measurement reference signal. In addition,
the network device may instruct, by using the third indication information, the terminal
device to receive the measurement reference signal in the second BP, so that the terminal
device knows, in a timely manner, a place to receive the measurement reference signal.
[0014] In a possible design, the terminal device receives a MIB sent by the network device,
and determines, based on the MIB, the first BP configured by the network device for
the terminal device. Alternatively, the terminal device determines, based on predefined
information, the first BP configured by the network device for the terminal device.
Correspondingly, the network device sends a MIB to the terminal device, where the
MIB is used to determine the first BP configured by the network device for the terminal
device. Alternatively, the network device configures the first BP for the terminal
device based on predefined information.
[0015] In this case, the first BP may be a BP allocated by the network device to the terminal
device during initial access of the terminal device. That is, a time point for allocating
the first BP is provided. For example, the network device may send the MIB to the
terminal device. After receiving the MIB, the terminal device may determine, based
on the MIB, the first BP allocated by the network device to the terminal device. Alternatively,
the terminal device may learn, based on the predefined information, the first BP allocated
by the network device to the terminal device. For example, the terminal device determines
a frequency domain resource of a synchronization signal through synchronization signal
blind detection, and then determines a frequency domain resource of the first BP based
on a predefined relationship. If the first BP is a BP allocated by the network device
to the terminal device during initial access of the terminal device, the first BP
may be activated by default.
[0016] In a possible design, the terminal device receives a system information block SIB
sent by the network device, and determines, based on the SIB, the first BP or the
second BP configured by the network device for the terminal device; or the terminal
device receives RRC signaling sent by the network device, and determines, based on
the RRC signaling, the first BP or the second BP configured by the network device
for the terminal device. Correspondingly, the network device sends a SIB to the terminal
device, where the SIB is used to determine the first BP or the second BP configured
by the network device for the terminal device; or the network device sends RRC signaling
to the terminal device, where the RRC signaling is used to determine the first BP
or the second BP configured by the network device for the terminal device.
[0017] In this case, the first BP may be a BP allocated by the network device to the terminal
device after the terminal device accesses a network. That is, another time point for
allocating the first BP is provided. In addition, the second BP may also be a BP allocated
by the network device to the terminal device after the terminal device accesses the
network. The time points for allocating the first BP and the second BP are not limited
in the embodiments of the present invention.
[0018] According to a third aspect, a terminal device is provided. The terminal device is
configured to perform the method according to the first aspect or any possible design
of the first aspect. Specifically, the terminal device includes a unit configured
to perform the method according to the first aspect or any possible design of the
first aspect.
[0019] According to a fourth aspect, a network device is provided. The network device is
configured to perform the method according to the second aspect or any possible design
of the second aspect. Specifically, the network device includes a unit configured
to perform the method according to the second aspect or any possible design of the
second aspect.
[0020] According to a fifth aspect, a terminal device is provided. The terminal device includes
a transceiver, a processor, and a memory. The transceiver, the processor, and the
memory may be connected by using a bus system. The memory is configured to store a
program, an instruction, or code. The processor is configured to execute the program,
the instruction, or the code in the memory, to complete the method according to the
first aspect or any possible design of the first aspect.
[0021] According to a sixth aspect, a network device is provided. The network device includes
a transceiver, a processor, and a memory. The transceiver, the processor, and the
memory may be connected by using a bus system. The memory is configured to store a
program, an instruction, or code. The processor is configured to execute the program,
the instruction, or the code in the memory, to complete the method according to the
second aspect or any possible design of the second aspect.
[0022] According to a seventh aspect, a computer-readable storage medium or a computer program
product is provided. The computer-readable storage medium or the computer program
product is configured to store a computer program. The computer program is used to
execute an instruction in the method according to the first aspect, the second aspect,
any possible design of the first aspect, or any possible design of the second aspect.
[0023] According to an eighth aspect, a communications system is provided. The system includes
the terminal device according to the third aspect or the fifth aspect and the network
device according to the fourth aspect or the sixth aspect.
[0024] According to a ninth aspect, a communication method is provided. The method may be
performed by a terminal device. The method includes: if the terminal device cannot
simultaneously monitor an activated first BP and an activated second BP, where the
first BP and the second BP are in a same carrier, and a USS is configured in the second
BP, detecting, by the terminal device, the USS in the second BP, where specific DCI
of the terminal device is configured in the USS, and the specific DCI of the terminal
device is used to indicate that the terminal device performs data transmission specific
to the terminal device in the second BP.
[0025] According to a tenth aspect, a communication method is provided. The method may be
performed by a network device. The network device is, for example, a base station.
The method includes: configuring and activating, by a network device, a first BP and
a second BP for a terminal device, where the first BP and the second BP are in a same
carrier, a USS is configured in the second BP, and the first BP and the second BP
cannot be simultaneously monitored by the terminal device; and sending, by the network
device, specific DCI of the terminal device in the USS in the second BP, where the
specific DCI of the terminal device is used to indicate that the terminal device performs
data transmission specific to the terminal device in the second BP.
[0026] In a possible design, the terminal device detects, within a first transmission time
unit, common DCI in a CSS configured in the first BP, and detects the specific DCI
of the terminal device in the USS within a second transmission time unit, where the
first transmission time unit is different from the second transmission time unit.
Correspondingly, the network device sends, within a first transmission time unit,
common DCI in a CSS configured in the first BP, and sends the specific DCI of the
terminal device in the USS within a second transmission time unit, where the first
transmission time unit is different from the second transmission time unit.
[0027] In a possible design, the terminal device detects, within the first transmission
time unit, the specific DCI of the terminal device in the CSS configured in the first
BP. Correspondingly, the network device sends, within the first transmission time
unit, the specific DCI of the terminal device in the CSS configured in the first BP.
[0028] According to an eleventh aspect, a terminal device is provided. The terminal device
may be configured to perform the method according to the ninth aspect or any possible
design of the ninth aspect. For example, the terminal device includes a first processing
unit and a second processing unit. The first processing unit is configured to determine
that an activated first BP and an activated second BP cannot be simultaneously monitored,
where the first BP and the second BP are in a same carrier, and a USS is configured
in the second BP. The second processing unit is configured to detect the USS in the
second BP, where specific downlink control information DCI of the terminal device
is configured in the USS, and the specific DCI of the terminal device is used to indicate
that the terminal device performs data transmission specific to the terminal device
in the second BP.
[0029] In a possible design, the second processing unit is further configured to: detect,
within a first transmission time unit, common DCI in a CSS configured in the first
BP, and detect the specific DCI of the terminal device in the USS within a second
transmission time unit, where the first transmission time unit is different from the
second transmission time unit.
[0030] In a possible design, the second processing unit is further configured to detect,
within the first transmission time unit, the specific DCI of the terminal device in
the CSS configured in the first BP.
[0031] According to a twelfth aspect, a network device is provided. The network device may
be configured to perform the method according to the tenth aspect or any possible
design of the tenth aspect. The network device includes a processing unit and a transceiver
unit. The processing unit is configured to configure and activate a first BP and a
second BP for a terminal device, where the first BP and the second BP are in a same
carrier, a USS is configured in the second BP, and the first BP and the second BP
cannot be simultaneously monitored by the terminal device. The transceiver unit is
configured to send specific DCI of the terminal device in the USS in the second BP,
where the specific DCI of the terminal device is used to indicate that the terminal
device performs data transmission specific to the terminal device in the second BP.
[0032] In a possible design, the transceiver unit is further configured to: send, within
a first transmission time unit, common DCI in a CSS configured in the first BP, and
send the specific DCI of the terminal device in the USS within a second transmission
time unit, where the first transmission time unit is different from the second transmission
time unit.
[0033] In a possible design, the transceiver unit is further configured to send, within
the first transmission time unit, the specific DCI of the terminal device in the CSS
configured in the first BP.
[0034] According to a thirteenth aspect, a terminal device is provided. The terminal device
may be configured to perform the method according to the ninth aspect or any possible
design of the ninth aspect. The terminal device includes a processor and a transceiver.
The processor is configured to: determine that an activated first BP and an activated
second BP cannot be simultaneously monitored, where the first BP and the second BP
are in a same carrier, and a USS is configured in the second BP; and use the transceiver
to detect the USS in the second BP, where specific downlink control information DCI
of the terminal device is configured in the USS, and the specific DCI of the terminal
device is used to indicate that the terminal device performs data transmission specific
to the terminal device in the second BP.
[0035] In a possible design, the processor is further configured to use the transceiver
to: detect, within a first transmission time unit, common DCI in a CSS configured
in the first BP, and detect the specific DCI of the terminal device in the USS within
a second transmission time unit, where the first transmission time unit is different
from the second transmission time unit.
[0036] In a possible design, the processor is further configured to use the transceiver
to detect, within the first transmission time unit, the specific DCI of the terminal
device in the CSS configured in the first BP.
[0037] According to a fourteenth aspect, a network device is provided. The network device
may be configured to perform the method according to the tenth aspect or any possible
design of the tenth aspect. The network device includes a processor and a transceiver.
The processor is configured to use the transceiver to configure and activate a first
BP and a second BP for a terminal device, where the first BP and the second BP are
in a same carrier, a USS is configured in the second BP, and the first BP and the
second BP cannot be simultaneously monitored by the terminal device. The processor
is further configured to use the transceiver to send specific DCI of the terminal
device in the USS in the second BP, where the specific DCI of the terminal device
is used to indicate that the terminal device performs data transmission specific to
the terminal device in the second BP.
[0038] In a possible design, the processor is further configured to use the transceiver
to: send, within a first transmission time unit, common DCI in a CSS configured in
the first BP, and send the specific DCI of the terminal device in the USS within a
second transmission time unit, where the first transmission time unit is different
from the second transmission time unit.
[0039] In a possible design, the processor is further configured to use the transceiver
to send, within the first transmission time unit, the specific DCI of the terminal
device in the CSS configured in the first BP.
[0040] According to a fifteenth aspect, a communications system is provided. The system
includes the terminal device according to the eleventh aspect or the thirteenth aspect
and the network device according to the twelfth aspect or the fourteenth aspect.
[0041] According to a sixteenth aspect, a computer-readable storage medium or a computer
program product is provided. The computer-readable storage medium or the computer
program product is configured to store a computer program. The computer program is
used to execute an instruction in the method according to the ninth aspect, the tenth
aspect, any possible design of the ninth aspect, or any possible design of the tenth
aspect.
BRIEF DESCRIPTION OF DRAWINGS
[0042]
FIG. 1 is a schematic diagram of an application scenario according to an embodiment
of the present invention;
FIG. 2 is a schematic diagram of a communication method according to an embodiment
of the present invention;
FIG. 3 is a schematic diagram illustrating that a first BP is included in a second
BP according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a terminal device according to an embodiment
of the present invention;
FIG. 5 is a schematic structural diagram of another terminal device according to another
embodiment of the present invention;
FIG. 6 is a schematic structural diagram of another terminal device according to another
embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a network device according to an embodiment
of the present invention;
FIG. 8 is a schematic structural diagram of another network device according to an
embodiment of the present invention; and
FIG. 9 is a schematic structural diagram of another network device according to an
embodiment of the present invention.
DESCRIPTION OF EMBODIMENTS
[0043] To make the objectives, technical solutions, and advantages of the embodiments of
the present invention clearer, the following further describes the embodiments of
the present invention in detail with reference to the accompanying drawings.
[0044] In the following, some terms in the embodiments of the present invention are described,
to help a person skilled in the art have a better understanding.
- (1) A terminal device includes a device that provides a user with voice and/or data
connectivity, for example, may include a handheld device with a wireless connection
function, or a processing device connected to a wireless modem. The terminal device
may communicate with a core network by using a radio access network (Radio Access
Network, RAN), and exchange voice and/or data with the RAN. The terminal device may
include user equipment (User Equipment, UE), a wireless terminal device, a mobile
terminal device, a subscriber unit (Subscriber Unit), a subscriber station (Subscriber
Station), a mobile station (Mobile Station), a mobile console (Mobile), a remote station
(Remote Station), an access point (Access Point, AP), a remote terminal device (Remote
Terminal), an access terminal device (Access Terminal), a user terminal device (User
Terminal), a user agent (User Agent), a user device (User Device), or the like. For
example, the terminal device may include a mobile phone (or referred to as a "cellular"
phone), a computer with a mobile terminal device, a portable, pocket-sized, handheld,
computer built-in, or in-vehicle mobile apparatus, or an intelligent wearable device.
For example, the terminal device may be a device such as a personal communication
service (Personal Communication Service, PCS) phone, a cordless telephone set, a Session
Initiation Protocol (Session Initiation Protocol, SIP) phone, a wireless local loop
(Wireless Local Loop, WLL) station, a personal digital assistant (Personal Digital
Assistant, PDA), a smartwatch, a smart helmet, smart glasses, or a smart band. The
terminal device further includes a limited device, for example, a device with relatively
low power consumption, a device with a limited storage capability, or a device with
a limited computing capability. For example, the terminal device includes information
sensing devices such as a barcode, radio frequency identification (Radio Frequency
Identification, RFID), a sensor, a global positioning system (Global Positioning System,
GPS), and a laser scanner.
- (2) A network device includes, for example, a base station (for example, an access
point), and may be a device that communicates with a wireless terminal device by using
one or more cells over an air interface and that is in an access network. The base
station may be configured to mutually convert a received over-the-air frame and an
internet protocol (IP) packet and serve as a router between the terminal device and
a rest portion of the access network. The rest portion of the access network may include
an IP network. The base station is mainly responsible for functions such as radio
resource management, quality of service (Quality of Service, QoS) management, and
data compression and encryption on an air interface side. On a core network side,
the base station is mainly responsible for forwarding control plane signaling to the
MME and forwarding user plane service data to the S-GW. The base station may further
coordinate attribute management of an air interface. For example, the base station
may include an evolved NodeB (NodeB or eNB or e-NodeB, evolutional NodeB) in an LTE
system or an LTE-advanced (LTE-Advanced, LTE-A) system, or may include a next-generation
NodeB (next generation NodeB, gNB) in an NR system. This is not limited in the embodiments
of the present invention.
- (3) A bandwidth part (Bandwidth part, BP) is a part of a channel bandwidth, or may
be referred to as an "operating bandwidth (English: operating bandwidth)" or a transmission
bandwidth. A mini BP (mini BP), a BP unit (BP Unit), a BP sub-band, and the like may
be referred to as a BP or a BWP. A name and an abbreviation of the bandwidth part
are not specifically limited in the embodiments of the present invention. A BP may
be a segment of continuous resources in frequency domain. For example, one bandwidth
part includes K (K>0) consecutive subcarriers, or one bandwidth part is a frequency
domain resource on which N (N>0) non-overlapping continuous resource blocks (Resource
Block, RB) are located, or one bandwidth part is a frequency domain resource on which
M (M > 0) non-overlapping continuous resource block groups (Resource Block Group,
RBG) are located, where one RBG includes P (P>0) continuous RBs. One bandwidth part
is related to one specific numerology (numerology). The numerology includes at least
one of a subcarrier spacing and a cyclic prefix (Cyclic Prefix, CP).
- (4) The "numerology (numerology)" in the embodiments of the present invention means
a series of physical layer parameters for an air interface (English: air interface).
During specific implementation, optionally, one BP may correspond to one numerology.
The numerology includes a subcarrier spacing, a type of a time unit, a type of a cyclic
prefix (cyclic prefix, CP), or the like. Using the subcarrier spacing as an example,
if the terminal device supports subcarrier spacings of 15 kHz and 30 kHz, the base
station may allocate a BP with a subcarrier spacing of 15 kHz and a BP with a subcarrier
spacing of 30 kHz to the terminal device. The terminal device may switch to a different
BP based on a different scenario and service requirement, or may simultaneously transmit
data on two or more BPs. When the terminal device supports a plurality of BPs, numerologies
corresponding to the BPs may be the same or different.
- (5) The terms "system" and "network" may be used interchangeably in the embodiments
of the present invention. The term "a plurality of" means two or more than two. In
view of this, the term "a plurality of" may also be understood as "at least two" in
the embodiments of the present invention. The term "and/or" describes an association
relationship for describing associated objects and represents that three relationships
may exist. For example, A and/or B may represent the following three cases: Only A
exists, both A and B exist, and only B exists. In addition, the character "/" usually
represents an "or" relationship between the associated objects unless specified otherwise.
[0045] Unless otherwise stated, in the embodiments of this application, ordinal numbers
such as "first" and "second" are intended to distinguish between a plurality of objects,
and not intended to limit an order, a time sequence, priorities, or importance of
the plurality of objects.
[0046] The technical solutions provided in this specification may be applied to a 5G NR
system (NR system for short hereinafter) or a long term evolution (Long Term Evolution,
LTE) system, and may further be applied to a next-generation mobile communications
system or another similar mobile communications system.
[0047] The following describes an application scenario of the embodiments of the present
invention. FIG. 1 is a schematic diagram of an application scenario according to an
embodiment of the present invention, and is also an architectural diagram of an LTE
system. Network elements in FIG. 1 include a mobility management entity (Mobility
Management Entity, MME), a serving gateway (Serving GateWay, S-GW), a base station,
and a terminal device.
[0048] MME/S-GW: The MME is a key control node in a 3rd Generation Partnership Project (3rd
Generation Partnership Project, 3GPP) LTE system, is a core-network network element,
and is mainly responsible for a signaling processing part, that is, a control plane
function, including functions such as access control, mobility management, attachment
and detachment, a session management function, and gateway selection. The S-GW is
an important network element in a core network in the 3GPP LTE system, and is mainly
responsible for a user plane function of user data forwarding, to be specific, routing
and forwarding a data packet under control of the MME
[0049] Main network elements in the embodiments of the present invention include the base
station and the terminal device. The base station configures a bandwidth part for
the terminal device, and the terminal device may work on the bandwidth part configured
by the base station. For some descriptions of the base station and the terminal device,
refer to the foregoing descriptions, and details are not further described.
[0050] The technical solutions provided in the embodiments of the present invention are
described below with reference to the accompanying drawings.
[0051] FIG. 2 shows a communication method according to an embodiment of the present invention.
Descriptions are provided below always by using an example in which the method provided
in the embodiments of the present invention is applied to the application scenario
shown in FIG. 1.
[0052] S21. On a network device side: A network device configures and activates a plurality
of BPs for a terminal device. The plurality of BPs are in a same carrier, the plurality
of BPs include a first BP and a second BP, a CSS, for example, a first CSS, is configured
in the first BP, and common DCI is configured in the first CSS.
[0053] S22. On a terminal device side: The terminal device determines that a plurality of
BPs are activated. The plurality of BPs are in a same carrier, the plurality of BPs
include a first BP and a second BP, a first CSS is configured in the first BP, and
common DCI is configured in the first CSS.
[0054] In the embodiments of the present invention, a quantity of BPs configured and activated
by the network device for the terminal device is greater than or equal to 2. The network
device may simultaneously allocate a plurality of BPs to the terminal device, for
example, simultaneously allocate the first BP and the second BP to the terminal device,
and the network device may simultaneously activate the first BP and the second BP.
Alternatively, the network device may configure different BPs for the terminal device
at different moments, for example, configure and activate the first BP for the terminal
device at a first moment, configure and activate the second BP for the terminal device
at a second moment, where the first moment may be before or after the second moment.
[0055] In a situation, the first BP may be a BP allocated by the network device to the terminal
device during initial access of the terminal device. For example, the network device
may send a master information block (Master Information Block, MIB) to the terminal
device. After receiving the MIB, the terminal device may determine, based on the MIB,
the first BP allocated by the network device to the terminal device. Alternatively,
the terminal device may learn, based on the predefined information, the first BP allocated
by the network device to the terminal device. For example, the terminal device determines
a frequency domain resource of a synchronization signal through synchronization signal
blind detection, and then determines a frequency domain resource of the first BP based
on a predefined relationship. If the first BP is a BP allocated by the network device
to the terminal device during initial access of the terminal device, the first BP
may be activated by default.
[0056] In another situation, the first BP may be a BP allocated by the network device to
the terminal device after the terminal device accesses a network. For example, the
network device may send a system information block (System Information Block, SIB)
to the terminal device. After receiving the SIB, the terminal device may determine,
based on the SIB, the first BP allocated by the network device to the terminal device.
Alternatively, the network device may send Radio Resource Control (Radio Resource
Control, RRC) signaling to the terminal device. After receiving the RRC signaling,
the terminal device may know, based on the RRC signaling, the first BP allocated by
the network device to the terminal device. Alternatively, the network device may indicate,
by using other signaling, the first BP allocated to the terminal device, for example,
indicate, by using dynamic signaling, the first BP allocated to the terminal device,
where the dynamic signaling is, for example, common DCI or specific DCI of the terminal
device. How the network device indicates the allocated first BP is not limited in
the embodiments of the present invention. In this case, the network device may activate,
by using common DCI, specific DCI of the terminal device, or higher layer signaling,
the first BP allocated to the terminal device. The higher layer signaling is, for
example, SIB, RRC signaling, or a media access control (Media Access Control, MAC)
control element (Control Element, CE).
[0057] The first BP includes a control resource set (Control Resource Set, CORESET). The
CORESET includes the first CSS, a numerology corresponding to a resource in the first
CSS is the same as a numerology corresponding to the first BP, and the first CSS may
be used to schedule a SIB. Certainly, another resource may further be configured in
the first BP. This is not limited in the embodiments of the present invention. The
numerology includes at least one of a subcarrier spacing and a type of a CP.
[0058] If the first BP is in an activated state, the terminal device can use the first BP.
Because the common DCI is configured in the first CSS, the terminal device may receive,
in the first CSS in the first BP that is in the activated state, the common DCI sent
by the network device. In addition, the terminal device may further send and receive
data in the first BP that is in the activated state, and so on.
[0059] S23. If a second CSS is configured in the second BP, a numerology corresponding to
a resource in the second CSS is the same as a numerology corresponding to the second
BP. In this case, the terminal device detects common DCI only in the second CSS in
which the common DCI is configured. Certainly, another resource different from the
second CSS may further be configured in the second BP. This is not limited in the
embodiments of the present invention.
[0060] In the embodiments of the present invention, the second BP may be a BP allocated
by the network device to the terminal device after the terminal device accesses the
network. When the first BP allocated by the network device to the terminal device
is used by the terminal device for initial access, a bandwidth of the first BP may
be relatively small. If all terminal devices can still work in the first BP after
accessing the network, scheduling congestion in the first BP may be caused. Consequently,
some terminal devices do not have sufficient available resources. For example, when
a relatively high transmission throughput needs to be obtained for a service performed
by a terminal device, resources may be insufficient. Therefore, after the terminal
device accesses a network, the network device may further re-allocate a BP to the
terminal device based on a bandwidth capability of the terminal device, for example,
allocate the second BP, so that the terminal device can better operate. Alternatively,
when a type of a to-be-transmitted service of the terminal device changes, the network
device may further re-allocate a BP to the terminal device, for example, allocate
the second BP, so as to match a service type requirement of the terminal device. Alternatively,
when needing to implement system load balance, the network device may further re-allocate
a BP to the terminal device, for example, allocate the second BP, to effectively improve
system resource utilization.
[0061] In the embodiments of the present invention, the first BP and the second BP may be
in a same carrier. For example, the network device may send a SIB to the terminal
device. After receiving the SIB, the terminal device may determine, based on the SIB,
the second BP allocated by the network device to the terminal device. Alternatively,
the network device may send RRC signaling to the terminal device. After receiving
the RRC signaling, the terminal device may know, based on the RRC signaling, the second
BP allocated by the network device to the terminal device. Alternatively, the network
device may indicate, by using other signaling, the second BP allocated to the terminal
device, for example, indicate, by using the common DCI or the specific DCI of the
terminal device, the second BP allocated to the terminal device. Alternatively, the
network device may allocate the second BP to the terminal device through predefinition.
In this case, the terminal device can determine, based on the predefined information,
the second BP allocated by the network device to the terminal device. How the network
device indicates the allocated second BP is not limited in the embodiments of the
present invention. In this case, the network device may activate, by using common
DCI, specific DCI of the terminal device, or higher layer signaling, the first BP
allocated to the terminal device. The higher layer signaling is, for example, SIB,
RRC signaling, or a MAC CE.
[0062] If the second CSS is configured in the second BP, and the common DCI is configured
in the second CSS, even though the first CSS is configured in the first BP, the terminal
device detects the common DCI only in the second CSS. That is, when the network device
configures and activates a plurality of BPs for the terminal device, and at least
two CSSs are configured in the plurality of BPs, the terminal device selects only
one of the CSSs to detect the common DCI, thereby avoiding an increase in a quantity
of blind detections of the terminal device.
[0063] In an implementation, the network device may indicate, a CSS on which the terminal
device detects the common DCI. For example, the network device sends first indication
information to the terminal device when the network device configures the second CSS
for the second BP, where the first indication information is used to instruct the
terminal device to detect the common DCI only in the second CSS. After receiving the
first indication information, the terminal device can determine that the common DCI
is detected only in the second CSS. Certainly, the common DCI is configured in the
second CSS. The first indication information may be carried in higher layer signaling,
for example, SIB or RRC signaling. The first indication information is, for example,
an identifier of the second BP or the second CSS, or an index of the second BP or
the second CSS. Alternatively, the first indication information may occupy one or
more bits, and values of the bits correspond to a CSS for detecting the common DCI.
An implementation form of the first indication information is not limited in the embodiments
of the present invention.
[0064] In addition, it should be noted that, that the terminal device detects the common
DCI only in the second CSS means that if there are a plurality of CSSs, the terminal
device detects the common DCI only in one of the CSSs, and the terminal device can
still use other CSSs. For example, the terminal device may further detect other information
in the first CSS, and in addition to the common DCI, may further detect other information
in the second CSS. It is not that the terminal device can only detect the common DCI
in the second CSS without detecting other information.
[0065] S21 and S22 are described by using an example in which the network device configures
the CSS for the second BP and the network device configures the common DCI in the
second CSS, that is, the network device sends the common DCI in the second CSS. Therefore,
the terminal device can directly detect the common DCI in the second CSS, and the
terminal device may no longer receive the common DCI in the first CSS. In this manner,
power consumption of the terminal device is not increased because the quantity of
blind detections of the terminal device is not increased. Certainly, in this manner,
the common DCI is not received in the first CSS. However, other resources in the first
BP and/or in the first CSS can still be used, thereby enabling the terminal device
to obtain more available resources while reducing system overheads.
[0066] In an optional manner, if the CSS is configured in the second BP, and the common
DCI is configured in the second CSS, the terminal device may alternatively choose
to deactivate the first BP. The deactivating the BP means that the terminal device
no longer uses the BP, and does not detect any control information or transmit and
receive data on the BP, that is, stops using all resources in the BP. In other words,
if the second CSS is configured in the second BP, and the common DCI is configured
in the second CSS, the second BP is sufficient for supporting operation of the terminal
device, and the terminal device may deactivate the first BP, that is, no longer use
the first BP. In this manner, resources can be effectively saved.
[0067] The foregoing describes the case in which the CSS is configured in the second BP,
if a CSS is not configured in the second BP, and a CSS is configured in the first
BP, the network device still sends the common DCI in the first CSS. In this case,
the terminal device still needs to receive the common DCI in the first CSS. In other
words, the network device configures at least one CSS for the terminal device. If
only one CSS is configured, the terminal device receives the common DCI in the CSS.
If a plurality of CSSs are configured for the terminal device, the terminal device
receives the common DCI on a CSS configured on one BP, without receiving the common
DCI in all of the plurality of CSSs. In this manner, system overheads are reduced,
and power consumption of the terminal device is reduced.
[0068] In addition to the common DCI, the terminal device further needs to detect specific
DCI of the terminal device. The specific DCI of the terminal device is DCI sent to
a specific terminal device. The terminal device may detect the specific DCI of the
terminal device in a CSS and a user-equipment-specific search space (UE-specific Search
Space, USS).
[0069] In the embodiments of the present invention, a first USS is configured in the first
BP, a numerology corresponding to a resource in the first USS is the same as the numerology
corresponding to the first BP, and the specific DCI of the terminal device is configured
in the first USS.
[0070] In an example, the terminal device can simultaneously monitor the first BP and the
second BP, that is, a total bandwidth of the first BP and the second BP is not greater
than a maximum bandwidth capability of the terminal device, and the terminal device
can simultaneously support the numerology corresponding to the first BP and the numerology
corresponding to the second BP. In this case, when the first BP and the second BP
correspond to a same numerology, if a second USS is not configured in the second BP,
the terminal device directly detects the first USS in the first BP. The specific DCI
of the terminal device is configured in the first USS, and the specific DCI of the
terminal device is used to indicate that the terminal device performs data transmission
specific to the terminal in the first BP and/or the second BP.
[0071] In another example, the terminal device can simultaneously monitor the first BP and
the second BP, that is, a total bandwidth of the first BP and the second BP is not
greater than a maximum bandwidth capability of the terminal device, and the terminal
device can simultaneously support the numerology corresponding to the first BP and
the numerology corresponding to the second BP. In this case, when the first BP and
the second BP correspond to a same numerology, if a second USS is configured in the
second BP, a numerology corresponding to a resource in the second USS is the same
as the numerology corresponding to the second BP, and the terminal device detects
first specific DCI of the terminal device in the first BP, and detects second specific
DCI of the terminal device in the second BP. The first specific DCI and/or the second
specific DCI of the terminal device is used to indicate that the terminal device performs
data transmission specific to the terminal device in the first BP and/or the second
BP. Alternatively, the terminal device receives indication information sent by the
network device, and determines to detect the specific DCI of the terminal device in
the first BP and/or the second BP. The indication information may be carried in higher
layer signaling, for example, SIB or RRC signaling. Alternatively, the indication
information may be carried in dynamic signaling, for example, the common DCI or the
specific DCI of the terminal device. The indication information is, for example, an
identifier of the first BP and/or the second BP, an identifier of the first CSS/the
second CSS, an index of the first BP and/or the second BP, or an index of the first
CSS and/or the second CSS. Alternatively, the indication information may occupy one
or more bits, and values of the bits correspond to a CSS for detecting the common
DCI. An implementation form of the indication information is not limited in the embodiments
of the present invention.
[0072] In another example, the terminal device can simultaneously monitor the first BP and
the second BP, that is, a total bandwidth of the first BP and the second BP is not
greater than a maximum bandwidth capability of the terminal device, and the terminal
device can simultaneously support the numerology corresponding to the first BP and
the numerology corresponding to the second BP. In this case, when the first BP and
the second BP correspond to different numerologies, if a second USS is configured
in the second BP, a numerology corresponding to a resource in the second USS is the
same as the numerology corresponding to the second BP, and the terminal device detects
first specific DCI of the terminal device in the first BP, and detects second specific
DCI of the terminal device in the second BP. The first specific DCI of the terminal
device is used to indicate that the terminal device performs data transmission specific
to the terminal device in the first BP, and the second specific DCI of the terminal
device is used to indicate that the terminal device performs data transmission specific
to the terminal device in the second BP.
[0073] In the foregoing three examples, that a total bandwidth of the first BP and the second
BP is not greater than a maximum bandwidth capability of the terminal device may be
described as: a difference between a maximum value of a highest frequency of the first
BP and a highest frequency of the second BP and a minimum value of a lowest frequency
of the first BP and a lowest frequency of the second BP is not greater than a maximum
bandwidth that can be supported by the terminal device. That the first BP and the
second BP correspond to a same numerology may be described as: the first BP and the
second BP correspond to a same subcarrier spacing, and the first BP and the second
BP correspond to a same CP type. That the first BP and the second BP correspond to
different numerologies may be described as: the first BP and the second BP correspond
to different subcarrier spacings, and/or the first BP and the second BP correspond
to different CP types.
[0074] In the embodiments of the present invention, if the terminal device cannot simultaneously
monitor the first BP and the second BP, that is, the total bandwidth of the first
BP and the second BP is greater than the maximum bandwidth capability of the terminal
device, or the terminal device cannot simultaneously support the numerology corresponding
to the first BP and the numerology corresponding to the second BP, the second USS
is configured in the second BP, and the numerology corresponding to the resource in
the second USS is the same as the numerology corresponding to the second BP, the terminal
device detects the second USS in the second BP. The specific DCI of the terminal device
is configured in the second USS, and the specific DCI of the terminal device is used
to indicate that the terminal device performs data transmission specific to the terminal
device in the second BP. In addition, if the second CSS is configured in the second
BP, the terminal device may further deactivate the first BP. That is, the terminal
device does not detect the first CSS and the first USS in the first BP. If no second
CSS is configured in the second BP, the terminal device cannot deactivate the first
BP. That is, the terminal device needs to detect the first CSS and the first USS in
the first BP.
[0075] In addition, if the terminal device cannot simultaneously monitor the first BP and
the second BP, and no second CSS is configured in the second BP, the network device
may send, within a first transmission time unit, the common DCI in the CSS configured
in the first BP, and the terminal device may detect, within the first transmission
time unit, the common DCI in the CSS configured in the first BP. In addition, the
network device may send, within a second transmission time unit, the specific DCI
of the terminal device in the USS configured in the second BP. If the terminal device
further needs to detect the specific DCI of the terminal device, the terminal device
may detect, within the second transmission time unit, the specific DCI of the terminal
device in the USS configured in the second BP. Moreover, in addition to sending the
common DCI in the first CSS, the network device may further send the specific DCI
of the terminal device in the CSS configured in the first BP, and the terminal device
may further detect, within the first transmission time unit, the specific DCI of the
terminal device in the CSS configured in the first BP. The first transmission time
unit is different from the second transmission time unit, and in a time sequence,
the first transmission time unit may be before or after the second transmission time
unit. In the embodiments of the present invention, the transmission time unit is,
for example, a subframe (subframe), a slot (slot), or a mini-slot (Mini-slot), slot
aggregation, mini-slot aggregation, or the like.
[0076] In the foregoing embodiment, that a total bandwidth of the first BP and the second
BP is greater than a maximum bandwidth capability of the terminal device may be described
as: a difference between a maximum value of a highest frequency of the first BP and
a highest frequency of the second BP and a minimum value of a lowest frequency of
the first BP and a lowest frequency of the second BP is greater than a maximum bandwidth
that can be supported by the terminal device.
[0077] Moreover, in addition to detecting the common DCI and the specific DCI of the terminal
device, the terminal device further receives a measurement reference signal. A specific
BP on which the terminal device receives the measurement reference signal is related
to a configuration between the first BP and the second BP. The measurement reference
signal is, for example, a channel state information-reference signal (Channel State
Information-Reference Signal, CSI-RS), or may be another signal.
[0078] In the embodiments of the present invention, if the terminal device can simultaneously
monitor the first BP and the second BP, that is, the total bandwidth of the first
BP and the second BP is not greater than the maximum bandwidth capability of the terminal
device, and the terminal device can simultaneously support the numerology corresponding
to the first BP and the numerology corresponding to the second BP, the terminal device
receives a measurement reference signal on both the first BP and the second BP, or
the terminal device receives indication information sent by the network device, and
determines to receive a measurement reference signal in the first BP and/or the second
BP.
[0079] For example, when a CSS is not configured on other BPs than the first BP in the plurality
of BPs, the network device may send second indication information to the terminal
device, where the second indication information is used to instruct the terminal device
to detect a measurement reference signal in the second BP. The terminal device may
receive the measurement reference signal in the second BP after receiving the second
indication information. The second indication information may be carried in higher
layer signaling, for example, SIB, RRC signaling, or a MAC CE. Alternatively, the
second indication information may be carried in dynamic signaling, for example, the
common DCI or the specific DCI of the terminal device. The second indication information
is, for example, an identifier of the first BP and/or the second BP, or an index of
the first BP and/or the second BP. Alternatively, the second indication information
may occupy one or more bits, and values of the bits correspond to a CSS for detecting
the common DCI. An implementation form of the second indication information is not
limited in the embodiments of the present invention.
[0080] Alternatively, for example, when a CSS, namely, the second CSS, is configured in
the second BP, the network device may send third indication information to the terminal
device, where the third indication information is used to instruct the terminal device
to detect a measurement reference signal in the second BP. The terminal device may
receive the measurement reference signal in the second BP after receiving the third
indication information. The third indication information may be carried in higher
layer signaling, for example, SIB, RRC signaling, or a MAC CE. Alternatively, the
third indication information may be carried in dynamic signaling, for example, the
common DCI or the specific DCI of the terminal device. The third indication information
is, for example, an identifier of the first BP and/or the second BP, or an index of
the first BP and/or the second BP. Alternatively, the third indication information
may occupy one or more bits, and values of the bits correspond to a CSS for detecting
the common DCI. An implementation form of the third indication information is not
limited in the embodiments of the present invention.
[0081] In some embodiments of the present invention, the first BP and the second BP allocated
to the terminal device may have different configurations. For example, a configuration
is that the first BP is included in the second BP. As shown in FIG. 3, if a numerology
corresponding to a measurement reference signal in the first BP is the same as a numerology
corresponding to a measurement reference signal in the second BP, the terminal device
only needs to receive the measurement reference signal in the second BP. This is because
either the terminal device or the network device can deduce a measurement result in
the first BP based on a measurement result in the second BP. In this manner, energy
conservation of the terminal device is further implemented, so that the terminal device
does not need to receive the measurement reference signal on a plurality of BPs. If
a numerology corresponding to a measurement reference signal in the first BP is different
from a numerology corresponding to a measurement reference signal in the second BP,
the terminal needs to receive a measurement reference signal on both the first BP
and the second BP. This is because neither the terminal device nor the network device
can deduce a measurement result in the first BP based on a measurement result in the
second BP.
[0082] In the embodiments of the present invention, if the terminal device cannot simultaneously
monitor the first BP and the second BP, that is, the total bandwidth of the first
BP and the second BP is greater than the maximum bandwidth capability of the terminal
device, or the terminal device cannot simultaneously support the numerology corresponding
to the first BP and the numerology corresponding to the second BP, the terminal device
receives a measurement reference signal in the second BP. In addition, if the second
CSS is configured in the second BP, the terminal device may further deactivate the
first BP. That is, the terminal device does not receive the measurement reference
signal in the first BP. If no second CSS is configured in the second BP, the terminal
device cannot deactivate the first BP. That is, the terminal device needs to receive
the measurement reference signal in the first BP.
[0083] In the embodiments of the present invention, the terminal device can detect the common
DCI only in one CSS, with no need to detect the common DCI in all CSSs configured
in the plurality of BPs. This can avoid an increase in the quantity of blind detections
of the terminal device and an increase in power consumption of the terminal device.
[0084] The following describes an apparatus corresponding to each method embodiment with
reference to the accompanying drawings.
[0085] FIG. 4 is a schematic diagram of a terminal device 400 according to an embodiment
of the present invention. The terminal device 400 may be applied to the scenario shown
in FIG. 1, and configured to perform the method shown in FIG. 2. As shown in FIG.
4, the terminal device 400 includes a first processing unit 401 and a second processing
unit 402. The terminal device 400 may further include a transceiver unit 403. The
transceiver unit 403 may be specifically configured to perform various information
sending and receiving performed by the terminal device in the embodiment shown in
FIG. 2. The first processing unit 401 and the second processing unit 402 are specifically
configured to perform other processing that is different from the information sending
and receiving and that is performed by the terminal device in the embodiment shown
in FIG. 2. The first processing unit 401 and the second processing unit 402 may be
a same functional component, or may be different functional components.
[0086] For example, the first processing unit 401 is configured to determine that a plurality
of BPs are activated, where the plurality of BPs are in a same carrier, the plurality
of BPs include a first BP and a second BP, a first CSS is configured in the first
BP, and common DCI is configured in the first CSS. The second processing unit 402
is configured to detect the common DCI only in a second CSS when the second CSS is
configured in the second BP, where the common DCI is configured in the second CSS.
[0087] For specific content, refer to specific descriptions in the embodiment shown in FIG.
2, and details are not described herein again.
[0088] It should be understood that division of the foregoing units is merely logical function
division. In actual implementation, all or some of units may be integrated into a
physical entity, or may be physically separated. In the embodiments of the present
invention, the transceiver unit 403 may be implemented by a transceiver, and the first
processing unit 401 and the second processing unit 402 may be implemented by a processor.
As shown in FIG. 5, a terminal device 500 may include a processor 501, a transceiver
502, and a memory 503. The memory 503 may be configured to store a program/code pre-installed
when the terminal device 500 is delivered from a factory, or may store code executed
by the processor 501, or the like.
[0089] It should be understood that, the terminal device 500 according to this embodiment
of the present invention may correspond to the terminal device in the embodiment shown
in FIG. 2 according to the embodiments of the present invention. The transceiver 502
is configured to perform various information sending and receiving performed by the
terminal device in the embodiment shown in FIG. 2, and the processor 501 is configured
to perform other processing that is different from the information sending and receiving
and that is performed by the terminal device in the embodiment shown in FIG. 2. Details
are not described herein again.
[0090] FIG. 6 is a schematic structural diagram of a terminal device. The terminal device
may be applied to the scenario shown in FIG. 1, and perform the method according to
the embodiment shown in FIG. 2. For ease of description, FIG. 6 shows only main components
of the terminal device. As shown in FIG. 6, a terminal device 60 includes a processor,
a memory, a control circuit, an antenna, and an input/output apparatus. The control
circuit is mainly configured to convert a baseband signal and a radio frequency signal
and process a radio frequency signal. The control circuit and the antenna together
may be referred to as a transceiver, and are mainly configured to: send and receive
a radio frequency signal in an electromagnetic wave form, receive a signaling indication
and/or a reference signal sent by a base station, and is configured to perform various
information sending and receiving performed by the terminal device in the embodiment
shown in FIG. 2. For details, refer to descriptions of the foregoing related part.
The processor is mainly configured to: process a communication protocol and communications
data, control an entire terminal device, execute a software program, and process data
of the software program, for example, configured to support the terminal device in
performing an action other than the information sending and receiving in the embodiment
shown in FIG. 2. The memory is mainly configured to store the software program and
data. The input/output apparatus, such as a touchscreen, a display screen, or a keyboard,
is mainly configured to receive data entered by a user and output data to the user.
[0091] After the terminal device is powered on, the processor may read a software program
in a storage unit, explain and execute an instruction of the software program, and
process data of the software program. When data needs to be sent in a wireless manner,
the processor performs baseband processing on the to-be-sent data, and outputs a baseband
signal to a radio frequency circuit. After the radio frequency circuit performs radio
frequency processing on the baseband signal, a radio frequency signal is sent by using
the antenna in an electromagnetic wave form. When data is sent to the terminal device,
the radio frequency circuit receives a radio frequency signal by using the antenna,
converts the radio frequency signal into a baseband signal, and outputs the baseband
signal to the processor, and the processor converts the baseband signal into data
and processes the data.
[0092] A person skilled in the art may understand that, for ease of description, FIG. 6
shows only one memory and one processor. In actual user equipment, a plurality of
processors and memories may exist. The memory may also be referred to as a storage
medium, a storage device, or the like. This is not limited in the embodiments of the
present invention.
[0093] In an optional implementation, the processor may include a baseband processor and
a central processing unit. The baseband processor is mainly configured to process
a communication protocol and communications data, and the central processing unit
is mainly configured to: control the entire terminal device, execute a software program,
and process data of the software program. Functions of the baseband processor and
the central processing unit are integrated into the processor in FIG. 6. A person
skilled in the art may understand that the baseband processor and the central processing
unit each may be an independent processor, and are interconnected by using technologies
such as a bus. A person skilled in the art may understand that the terminal device
may include a plurality of baseband processors to adapt to different network standards,
the terminal device may include a plurality of central processing units to enhance
a processing capability of the terminal device, and all components of the terminal
device may be connected to each other by using various buses. The baseband processor
may also be expressed as a baseband processing circuit or a baseband processing chip.
The central processing unit may also be expressed as a central processing circuit
or a central processing chip. A function of processing a communication protocol and
communications data may be built into the processor, or may be stored in a storage
unit in a form of a software program, so that the processor executes the software
program to implement a baseband processing function.
[0094] For example, in the embodiments of the present invention, the antenna and the control
circuit that have receiving and sending functions may be considered as a transceiver
unit 601 of the terminal device 60, and the processor having a processing function
may be considered as a processing unit 602 of the terminal device 60. As shown in
FIG. 6, the terminal device 60 includes the transceiver unit 601 and the processing
unit 602. The transceiver unit may also be referred to as a transceiver, a transceiver,
a transceiver apparatus, or the like. Optionally, a component that is in the transceiver
unit 601 and that is configured to implement a receiving function may be considered
as a receiving unit, and a component that is in the transceiver unit 601 and that
is configured to implement a sending function may be considered as a sending unit.
That is, the transceiver unit 601 includes the receiving unit and the sending unit.
For example, the receiving unit may also be referred to as a receiver, a receiver,
a receiver circuit, or the like, and the sending unit may also be referred to as a
transmitter, a transmitter, a transmitter circuit, or the like.
[0095] The transceiver in the embodiments of the present invention may be a wired transceiver,
a wireless transceiver, or a combination thereof. The wired transceiver may be, for
example, an Ethernet interface. The Ethernet interface may be an optical interface,
an electrical interface, or a combination thereof. The wireless transceiver may be,
for example, a wireless local area network transceiver, a cellular network transceiver,
or a combination thereof. The processor may be a central processing unit (central
processing unit, CPU), a network processor (network processor, NP), or a combination
of a CPU and an NP. The processor may further include a hardware chip. The hardware
chip may be an application-specific integrated circuit (application-specific integrated
circuit, ASIC), a programmable logic device (programmable logic device, PLD), or a
combination thereof. The PLD may be a complex programmable logic device (complex programmable
logic device, CPLD), a field-programmable gate array (field-programmable gate array,
FPGA), a generic array logic (generic array logic, GAL), or any combination thereof.
The memory may include a volatile memory (volatile memory), for example, a random
access memory (random-access memory, RAM). Alternatively, the memory may include a
non-volatile memory (English: non-volatile memory), for example, a read-only memory
(read-only memory, ROM), a flash memory (flash memory), a hard disk drive (hard disk
drive, HDD), or a solid-state drive (solid-state drive, SSD). Alternatively, the memory
may include a combination of the foregoing types of memories.
[0096] FIG. 7 is a schematic diagram of a network device 700 according to an embodiment
of the present invention. The network device 700 may be applied to the scenario shown
in FIG. 1, and configured to perform the method in the embodiment shown in FIG. 2.
As shown in FIG. 7, the network device 700 includes a processing unit 701 and a transceiver
unit 702. The transceiver unit 702 may be specifically configured to perform various
information sending and receiving performed by the network device in the embodiment
shown in FIG. 2. The processing unit 701 is specifically configured to perform other
processing that is different from the information sending and receiving and that is
performed by the network device in the embodiment shown in FIG. 2.
[0097] For example, the processing unit 701 may be configured to configure and activate
a plurality of BPs for a terminal device, where the plurality of BPs are in a same
carrier, the plurality of BPs include a first BP and a second BP, a first CSS is configured
in the first BP, common DCI is configured in the first CSS, a second CSS is configured
in the second BP, and the common DCI is configured in the second CSS. The transceiver
unit 702 may be configured to send first indication information to the terminal device,
where the first indication information is used to instruct the terminal device to
detect the common DCI only in the second CSS.
[0098] For specific content, refer to descriptions of the related part in the embodiment
shown in FIG. 2, and details are not described herein again.
[0099] It should be understood that division of the foregoing units is merely logical function
division. In actual implementation, all or some of units may be integrated into a
physical entity, or may be physically separated. In the embodiments of the present
invention, the transceiver unit 702 may be implemented by a transceiver, and the processing
unit 701 may be implemented by a processor. As shown in FIG. 8, a network device 800
may include a processor 801, a transceiver 802, and a memory 803. The memory 503 may
be configured to store a program/code pre-installed when the network device 800 is
delivered from a factory, or may store code executed by the processor 801, or the
like.
[0100] It should be understood that, the network device 800 according to this embodiment
of the present invention may correspond to the network device in the embodiment shown
in FIG. 2 according to the embodiments of the present invention. The transceiver 802
is configured to perform various information sending and receiving performed by the
network device in the embodiment shown in FIG. 2, and the processor 801 is configured
to perform other processing that is different from the information sending and receiving
and that is performed by the network device in the embodiment shown in FIG. 2. Details
are not described herein again.
[0101] FIG. 9 is a schematic structural diagram of a network device 90. The network device
90 may be, for example, a base station. The network device 90 may be applied to the
system shown in FIG. 1, and configured to perform the method in the embodiment shown
in FIG. 2. The network device 90 includes one or more remote radio units (remote radio
unit, RRU) 901 and one or more baseband units (baseband unit, BBU) 902. The RRU 901
may be referred to as a transceiver unit, a transceiver, a transceiver circuit, a
transceiver, or the like, and may include at least one antenna 9011 and a radio frequency
unit 9012. The RRU 901 is mainly configured to send and receive a radio frequency
signal and convert a radio frequency signal and a baseband signal, for example, is
configured to perform various information sending and receiving performed by the network
device in the embodiment shown in FIG. 2. The BBU 902 is mainly configured to perform
baseband processing, control the network device, and the like. The RRU 901 and the
BBU 902 may be physically disposed together, or may be physically separated, for example,
a distributed base station.
[0102] The BBU 902 is a control center of the network device, may also be referred to as
a processing unit, and is mainly configured to complete a baseband processing function,
such as channel encoding, multiplexing, modulation, and spreading. For example, the
BBU (the processing unit) may be configured to control the network device to perform
other processing that is different from the information sending and receiving in the
embodiment shown in FIG. 2.
[0103] In an example, the BBU 902 may include one or more boards, where a plurality of boards
may commonly support a radio access network (for example, an LTE network) of a single
access standard, or may respectively support radio access networks of different standards.
The BBU 902 further includes a memory 9021 and a processor 9022. The memory 9021 is
configured to store a necessary instruction and data. The processor 9022 is configured
to control the network device to perform a necessary action, for example, configured
to control the network device to perform other processing that is different from the
information sending and receiving in the embodiment shown in FIG. 2. The memory 9021
and the processor 9022 may serve one or more boards. In other words, a memory and
a processor may be separately disposed on each board. Alternatively, a plurality of
boards may use a same memory and processor. In addition, a necessary circuit is further
disposed on each board.
[0104] In FIG. 5 and FIG. 8, a bus interface may further be included. The bus interface
may include any quantity of interconnected buses and bridges. Specifically, the bus
interface links together various circuits of one or more processors represented by
the processor and memories represented by the memory. The bus interface may further
link together various other circuits such as a peripheral device, a voltage regulator,
and a power management circuit. This is well known in the art, and therefore is not
further described in this specification. The bus interface provides an interface.
The transceiver provides a unit for communicating with various other devices on a
transmission medium. The processor is responsible for managing a bus architecture
and general processing. The memory may store data used when the processor performs
an operation.
[0105] A person skilled in the art may further understand that various illustrative logical
blocks (illustrative logic block) and steps (step) that are listed in the embodiments
of the present invention may be implemented by using electronic hardware, computer
software, or a combination thereof. Whether the functions are implemented by using
hardware or software depends on particular applications and a design requirement of
an entire system. A person skilled in the art may use various methods to implement
the described functions for each particular application, but it should not be understood
that the implementation goes beyond the protection scope of the embodiments of the
present invention.
[0106] Functions of various logic units and circuits described in the embodiments of the
present invention may be implemented or performed by using a design of a general-purpose
processor, a digital signal processor, an application-specific integrated circuit
(application specific integrated circuit, ASIC), a field-programmable gate array (field-programmable
gate array, FPGA) or another programmable logic device, discrete gate or transistor
logic device, discrete hardware component, or any combination thereof. The general-purpose
processor may be a microprocessor. Optionally, the general-purpose processor may also
be any conventional processor, controller, microcontroller, or state machine. The
processor may alternatively be implemented by a combination of computing apparatuses,
such as a digital signal processor and a microprocessor, a plurality of microprocessors,
one or more microprocessors together with a digital signal processor core, or any
other similar configuration.
[0107] Steps of the methods or algorithms described in the embodiments of the present invention
may be directly embedded into hardware, a software unit executed by the processor,
or a combination thereof. The software unit may be stored in a RAM memory, a flash
memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk,
a removable magnetic disk, a CD-ROM, or a storage medium of any other form in the
art. For example, the storage medium may connect to the processor, so that the processor
may read information from the storage medium and write information to the storage
medium. Optionally, the storage medium may be integrated into the processor. The processor
and the storage medium may be arranged in an ASIC, and the ASIC may be arranged in
UE. Optionally, the processor and the storage medium may be arranged in different
components of the UE.
[0108] It should be understood that sequence numbers of the processes do not mean execution
sequences in various embodiments of this application. The execution sequences of the
processes should be determined based on functions and internal logic of the processes,
and should not constitute any limitation on the implementation processes of the embodiments
of the present invention.
[0109] All or some of the foregoing embodiments may be implemented by means of software,
hardware, firmware, or any combination thereof. When software is used to implement
the embodiments, the embodiments may be implemented completely or partially in a form
of a computer program product. The computer program product includes one or more computer
instructions. When the computer program instructions are loaded and executed on the
computer, the procedure or functions according to the embodiments of the present invention
are all or partially generated. The computer may be a general-purpose computer, a
dedicated computer, a computer network, or other programmable apparatuses. The computer
instructions may be stored in a computer-readable storage medium or transmitted from
a computer-readable storage medium to another computer-readable storage medium. For
example, the computer instructions may be transmitted from a website, computer, server,
or data center to another website, computer, server, or data center in a wired (for
example, a coaxial cable, an optical fiber, or a digital subscriber line (DSL)) or
wireless (for example, infrared, radio, or microwave) manner. The computer-readable
storage medium may be any usable medium accessible by a computer, or a data storage
device, such as a server or a data center, integrating one or more usable media. The
usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, or
a magnetic tape), an optical medium (for example, a DVD), a semiconductor medium (for
example, a solid state disk (Solid State Disk, SSD)), or the like.
[0110] The embodiments in this specification are all described in a progressive manner,
for same or similar parts in the embodiments, refer to these embodiments, and each
embodiment focuses on a difference from other embodiments. In particular, apparatus
and system embodiments are basically similar to a method embodiment, and therefore
are described briefly; for related parts, refer to partial descriptions in the method
embodiment.
[0111] The foregoing descriptions of this specification in this application may enable a
person skilled in the art to use or implement the content of this application. It
should be considered that any modification made based on the disclosed content is
obvious in the art. The basic principles described in this application may be applied
to other variations without departing from the essence and scope of this application.
Therefore, the content disclosed in this application is not limited to the described
embodiments and designs, but may further be extended to a maximum scope that is consistent
with the principles of this application and new features disclosed in this application.
1. A communication method, comprising:
determining, by a terminal device, that a plurality of bandwidth partsBP are activated,
wherein the plurality of BPs are in a same carrier, the plurality of BPs comprise
a first BP and a second BP, a first common search spaceCSS is configured in the first
BP, and common downlink control information DCI is configured in the first CSS; and
detecting, by the terminal device, the common DCI only in a second CSS when the second
CSS is configured in the second BP, wherein the common DCI is configured in the second
CSS.
2. The method according to claim 1, wherein the method further comprises:
when a CSS is not configured on other BPs than the first BP in the plurality of BPs,
detecting, by the terminal device, the common DCI in the first CSS, and receiving
a measurement reference signal in the second BP.
3. The method according to claim 1 or 2, wherein when the second CSS is configured in
the second BP, the method further comprises:
receiving, by the terminal device, first indication information sent by a network
device, wherein the first indication information is used to instruct the terminal
device to detect the common DCI in the second CSS.
4. The method according to any one of claims 1 to 3, wherein
when the second CSS is configured in the second BP, the method further comprises:
receiving, by the terminal device, the measurement reference signal in the second
BP.
5. The method according to any one of claims 1 to 4, wherein the method further comprises:
receiving, by the terminal device, a master information blockMIB sent by the network
device, and determining, by the terminal device based on the MIB, the first BP configured
by the network device for the terminal device; or
determining, by the terminal device based on predefined information, the first BP
configured by the network device for the terminal device.
6. The method according to any one of claims 1 to 4, wherein the method further comprises:
receiving, by the terminal device, a system information blockSIB sent by the network
device, and determining, by the terminal device based on the SIB, the first BP or
the second BP configured by the network device for the terminal device; or
receiving, by the terminal device, radio resource controlRRC signaling sent by the
network device, and determining, by the terminal device based on the RRC signaling,
the first BP or the second BP configured by the network device for the terminal device.
7. The method according to any one of claims 1 to 6, wherein the common DCI comprises
DCI used to schedule the SIB.
8. A communication method, comprising:
configuring and activating, by a network device, a plurality of bandwidth parts BP
for a terminal device, wherein the plurality of BPs are in a same carrier, the plurality
of BPs comprise a first BP and a second BP, a first common search spaceCSS is configured
in the first BP, and common downlink control information DCI is configured in the
first CSS; and
sending, by the network device, first indication information to the terminal device
when the network device configures a second CSS for the second BP, wherein the first
indication information is used to instruct the terminal device to detect the common
DCI only in the second CSS, and the common DCI is configured in the second CSS.
9. The method according to claim 8, wherein when a CSS is not configured on other BPs
than the first BP in the plurality of BPs, the method further comprises:
sending, by the network device, second indication information to the terminal device,
wherein the second indication information is used to instruct the terminal device
to receive a measurement reference signal in the second BP.
10. The method according to claim 8 or 9, wherein when the second CSS is configured in
the second BP, the method further comprises:
sending, by the network device, third indication information to the terminal device,
wherein the third indication information is used to instruct the terminal device to
receive a measurement reference signal in the second BP.
11. The method according to any one of claims 8 to 10, wherein the method further comprises:
sending, by the network device, a master information blockMIB to the terminal device,
wherein the MIB is used to determine the first BP configured by the network device
for the terminal device; or
configuring, by the network device, the first BP for the terminal device based on
predefined information.
12. The method according to any one of claims 8 to 10, wherein the method further comprises:
sending, by the network device, a system information blockSIB to the terminal device,
wherein the SIB is used to determine the first BP or the second BP configured by the
network device for the terminal device; or
sending, by the network device, radio resource controlRRC signaling to the terminal
device, wherein the RRC signaling is used to determine the first BP or the second
BP configured by the network device for the terminal device.
13. The method according to any one of claims 8 to 12, wherein the common DCI comprises
DCI used to schedule the SIB.
14. A terminal device, comprising:
a first processing unit, configured to determine that a plurality of bandwidth partsBP
are activated, wherein the plurality of BPs are in a same carrier, the plurality of
BPs comprise a first BP and a second BP, a first common search spaceCSS is configured
in the first BP, and common downlink control information DCI is configured in the
first CSS; and
a second processing unit, configured to detect the common DCI only in a second CSS
when the second CSS is configured in the second BP, wherein the common DCI is configured
in the second CSS.
15. The terminal device according to claim 14, wherein the terminal device further comprises
a transceiver unit, wherein
the second processing unit is further configured to detect the common DCI in the first
CSS when a CSS is not configured on other BPs than the first BP in the plurality of
BPs; and
the transceiver unit is configured to receive a measurement reference signal in the
second BP when a CSS is not configured on other BPs than the first BP in the plurality
of BPs.
16. The terminal device according to claim 14 or 15, wherein the terminal device further
comprises the transceiver unit, and when the second CSS is configured in the second
BP, the transceiver unit is configured to:
receive first indication information sent by a network device, wherein the first indication
information is used to instruct the terminal device to detect the common DCI in the
second CSS.
17. The terminal device according to any one of claims 14 to 16, wherein the terminal
device further comprises the transceiver unit, and when the second CSS is configured
in the second BP, the transceiver unit is configured to:
receive a measurement reference signal in the second BP.
18. The terminal device according to any one of claims 14 to 17, wherein the terminal
device further comprises the transceiver unit, wherein
the transceiver unit is configured to receive a master information blockMIB sent by
the network device, and the first processing unit is further configured to determine,
based on the MIB, the first BP configured by the network device for the terminal device;
or
the first processing unit is further configured to determine, based on predefined
information, the first BP configured by the network device for the terminal device.
19. The terminal device according to any one of claims 14 to 17, wherein the terminal
device further comprises the transceiver unit, wherein
the transceiver unit is configured to receive a system information blockSIB sent by
the network device, and the first processing unit is further configured to determine,
based on the SIB, the first BP or the second BP configured by the network device for
the terminal device; or
the transceiver unit is configured to receive radio resource controlRRC signaling
sent by the network device, and the first processing unit is further configured to
determine, based on the RRC signaling, the first BP or the second BP configured by
the network device for the terminal device.
20. The terminal device according to any one of claims 14 to 19, wherein the common DCI
comprises DCI used to schedule the SIB.
21. A network device, comprising:
a processing unit, configured to configure and activate a plurality of bandwidth parts
BP for a terminal device, wherein the plurality of BPs are in a same carrier, the
plurality of BPs comprise a first BP and a second BP, a first common search spaceCSS
is configured in the first BP, and common DCI is configured in the first CSS; and
a transceiver unit, configured to send first indication information to the terminal
device when the network device configures a second CSS for the second BP, wherein
the first indication information is used to instruct the terminal device to detect
the common DCI only in the second CSS, and the common DCI is configured in the second
CSS.
22. The network device according to claim 21, wherein when a CSS is not configured on
other BPs than the first BP in the plurality of BPs, the transceiver unit is further
configured to:
send second indication information to the terminal device, wherein the second indication
information is used to instruct the terminal device to receive a measurement reference
signal in the second BP.
23. The network device according to claim 21 or 22, wherein when the second CSS is configured
in the second BP, the transceiver unit is further configured to:
send third indication information to the terminal device, wherein the third indication
information is used to instruct the terminal device to receive a measurement reference
signal in the second BP.
24. The network device according to any one of claims 21 to 23, wherein
the transceiver unit is further configured to send a master information block MIB
to the terminal device, wherein the MIB is used to determine the first BP configured
by the network device for the terminal device; or
the processing unit is further configured to configure the first BP for the terminal
device based on predefined information.
25. The network device according to any one of claims 21 to 23, wherein
the transceiver unit is further configured to send a system information block SIB
to the terminal device, wherein the SIB is used to determine the first BP or the second
BP configured by the network device for the terminal device; or
the transceiver unit is further configured to send radio resource control RRC signaling
to the terminal device, wherein the RRC signaling is used to determine the first BP
or the second BP configured by the network device for the terminal device.
26. The network device according to any one of claims 21 to 25, wherein the common DCI
comprises DCI used to schedule the SIB.
27. A communications system, comprising the terminal device according to any one of claims
14 to 20 and the network device according to any one of claims 21 to 26.
28. A communication method, comprising:
if a terminal device is incapable of simultaneously monitoring an activated first
bandwidth part BP and an activated second BP, wherein the first BP and the second
BP are in a same carrier, and a user-equipment-specific search space USS is configured
in the second BP,
detecting, by the terminal device, the USS in the second BP, wherein specific downlink
control information DCI of the terminal device is configured in the USS, and the specific
DCI of the terminal device is used to indicate that the terminal device performs data
transmission specific to the terminal device in the second BP.
29. The method according to claim 28, wherein the method further comprises:
detecting, by the terminal device within a first transmission time unit, common DCI
in a common search space CSS configured in the first BP, and detecting the specific
DCI of the terminal device in the USS within a second transmission time unit, wherein
the first transmission time unit is different from the second transmission time unit.
30. The method according to claim 29, wherein the method further comprises:
detecting, by the terminal device within the first transmission time unit, the specific
DCI of the terminal device in the CSS configured in the first BP.
31. A communication method, comprising:
configuring and activating, by a network device, a first bandwidth part BP and a second
BP for a terminal device, wherein the first BP and the second BP are in a same carrier,
a user-equipment-specific search space USS is configured in the second BP, and the
first BP and the second BP are incapable of being simultaneously monitored by the
terminal device; and
sending, by the network device, specific downlink control information DCI of the terminal
device in the USS in the second BP, wherein the specific DCI of the terminal device
is used to indicate that the terminal device performs data transmission specific to
the terminal device in the second BP.
32. The method according to claim 31, wherein the method further comprises:
sending, by the network device within a first transmission time unit, common DCI in
a common search space CSS configured in the first BP, and sending the specific DCI
of the terminal device in the USS within a second transmission time unit, wherein
the first transmission time unit is different from the second transmission time unit.
33. The method according to claim 32, wherein the method further comprises:
sending, by the network device within the first transmission time unit, the specific
DCI of the terminal device in the CSS configured in the first BP.
34. A terminal device, comprising:
a first processing unit, configured to determine that an activated first bandwidth
part BP and an activated second BP are incapable of being simultaneously monitored,
wherein the first BP and the second BP are in a same carrier, and a user-equipment-specific
search space USS is configured in the second BP; and
a second processing unit, configured to detect the USS in the second BP, wherein specific
downlink control information DCI of the terminal device is configured in the USS,
and the specific DCI of the terminal device is used to indicate that the terminal
device performs data transmission specific to the terminal device in the second BP.
35. The terminal device according to claim 34, wherein the second processing unit is further
configured to:
detect, within a first transmission time unit, common DCI in a common search space
CSS configured in the first BP, and detect the specific DCI of the terminal device
in the USS within a second transmission time unit, wherein the first transmission
time unit is different from the second transmission time unit.
36. The terminal device according to claim 35, wherein the second processing unit is further
configured to:
detect, within the first transmission time unit, the specific DCI of the terminal
device in the CSS configured in the first BP.
37. A network device, comprising:
a processing unit, configured to configure and activate a first bandwidth part BP
and a second BP for a terminal device, wherein the first BP and the second BP are
in a same carrier, a user-equipment-specific search space USS is configured in the
second BP, and the first BP and the second BP are incapable of being simultaneously
monitored by the terminal device; and
a transceiver unit, configured to send specific downlink control information DCI of
the terminal device in the USS in the second BP, wherein the specific DCI of the terminal
device is used to indicate that the terminal device performs data transmission specific
to the terminal device in the second BP.
38. The network device according to claim 37, wherein the transceiver unit is further
configured to:
send, within a first transmission time unit, common DCI in a common search space CSS
configured in the first BP, and send the specific DCI of the terminal device in the
USS within a second transmission time unit, wherein the first transmission time unit
is different from the second transmission time unit.
39. The network device according to claim 38, wherein the transceiver unit is further
configured to:
send, within the first transmission time unit, the specific DCI of the terminal device
in the CSS configured in the first BP.
40. A communications system, comprising the terminal device according to any one of claims
34 to 36 and the network device according to any one of claims 37 to 39.
41. A computer-readable storage medium, comprising an instruction, wherein when the instruction
is run on a computer, the computer is enabled to perform the method according to any
one of claims 1 to 7, the method according to any one of claims 8 to 13, the method
according to any one of claims 28 to 30, or the method according to any one of claims
31 to 33.